Motorola SBG900 User Manual download pdf (Page 124)

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SBG900 User Guide

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Configuration: Basic Gateway TCP/IP Wireless USB

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port mirroring A feature that enables one port (source) on the SBG900 to be copied to another port (destination) to

be studied. The destination mirrors the transmitted (from) or received (to) data on the source port to

enable the person managing the network to monitor activity.

port triggering A mechanism that allows incoming communication with specified applications. Primarily used for

gaming applications.

PPP Point-to-Point Protocol is used to transport other protocols, typically for simple links over serial lines. It

is most commonly used to access the Internet with a dial-up modem.

PPTP Point-to-Point Tunneling Protocol encapsulates other protocols. It is a new technology to create VPNs

developed jointly by several vendors.

private IP

address

An IP address assigned to a computer on the SBG900 LAN by the DHCP server on the SBG900 for a

specified lease time. Private IP addresses are used by the SBG900 LAN only; they are invisible to

devices on the Internet. See also

public IP address

protocol A formal set of rules and conventions for exchanging data. Different computer types (for example PC,

UNIX, or mainframe) can communicate if they support common protocols.

provisioning The process of autodiscovery or manually configuring a cable modem on the CMTS.

PSTN The public switched telephone network is the traditional circuit-switched, voice-oriented telephone

network. See also

POTS

public IP

address

The IP address assigned to the SBG900 by the cable service provider. A public IP address is visible to

devices on the Internet. See also

private IP address

QAM Quadrature Amplitude Modulation uses amplitude and phase modulation to encode multiple bits of

data in one signaling element. QAM achieves faster data transfer than amplitude or phase modulation

alone, but the signal is more prone to errors caused by noise. QAM requires a transmission circuit with

a higher CNR than alternate modulation formats such as QPSK. Two types of QAM are:

• 16 QAM encodes four bits per symbol as one of 16 possible amplitude and phase combinations.

• 64 QAM encodes six bits per symbol as one of 64 possible amplitude and phase combinations.

QPSK Quadrature Phase Shift Key (QPSK) modulation sends two bits of information per symbol period with

one symbol 90 degrees out of phase with other symbols. The four constellation points represented by

the coordinates (0,0 - 0,1 - 1,0 - 1,1) represent the four possible combinations.

QoS Quality of service describes the priority, delay, throughput, and bandwidth of a connection.

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